Input validation error in Apache HTTP Server

1) Input validation error

EUVDB-ID: #VU32549

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-6438

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The dav_xml_get_cdata function in main/util.c in the mod_dav module in the Apache HTTP Server before 2.4.8 does not properly remove whitespace characters from CDATA sections, which allows remote attackers to cause a denial of service (daemon crash) via a crafted DAV WRITE request.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.7

CPE2.3

• cpe:2.3:a:apache_foundation:apache_http_server:2.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.4.0.1:*:*:*:*:*:*:*

External links

https://advisories.mageia.org/MGASA-2014-0135.html
https://archives.neohapsis.com/archives/bugtraq/2014-10/0101.html
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10698
https://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html
https://marc.info/?l=bugtraq&m=141017844705317&w=2
https://marc.info/?l=bugtraq&m=141390017113542&w=2
https://seclists.org/fulldisclosure/2014/Dec/23
https://secunia.com/advisories/58230
https://secunia.com/advisories/59315
https://secunia.com/advisories/59345
https://secunia.com/advisories/60536
https://security.gentoo.org/glsa/glsa-201408-12.xml
https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x/CHANGES
https://svn.apache.org/viewvc/httpd/httpd/trunk/modules/dav/main/util.c
https://svn.apache.org/viewvc/httpd/httpd/trunk/modules/dav/main/util.c?r1=1528718&r2=1556428&diff_format=h
https://www.apache.org/dist/httpd/CHANGES_2.4.9
https://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
https://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
https://www.securityfocus.com/archive/1/534161/100/0/threaded
https://www.securityfocus.com/bid/66303
https://www.ubuntu.com/usn/USN-2152-1
https://www.vmware.com/security/advisories/VMSA-2014-0012.html
https://www-01.ibm.com/support/docview.wss?uid=swg21669554
https://www-01.ibm.com/support/docview.wss?uid=swg21676091
https://www-01.ibm.com/support/docview.wss?uid=swg21676092
https://blogs.oracle.com/sunsecurity/entry/multiple_input_validation_vulnerabilities_in1
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b@%3Ccvs.httpd.apache.org%3E
https://puppet.com/security/cve/cve-2013-6438
https://support.apple.com/HT204659
https://support.apple.com/kb/HT6535

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.